Elevator-door-operating device



L. E. GROAT AND F. F. BRUSH. ELEVATOR DOOR OPERATING DEVICE.

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APPLICATION FILED MAY 26, 1919. 13

6 SHEETS-SHEET 2.

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E rzdezzfons r2 Graczf L. E. GROAT AND F. F. BRUSH. ELEVATOR DOOROPERATING DEVICE. APPLICATION FILED MAY 26, 1919. 1,400,215.

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L. E. GROAT A-ND F. F. BRUSH. ELEVATOR DOOR OPERATING DEVICE.

Y v APPLICATION FILED MAYZB 1919-. 1,400,215; Patented Dec. 13, 1921.

6 SHEETS-SHEET 1- L. E. GROAT AND F; F. BRUSH; ELEVATOR DOOR OPERATINGDEVICE.

. APPLICATION FILED MAY 25- l9.l 9-

' Patented D60. 13, 1921.

6 SHEETS-SHEET 5.

Alllll \HIHI 2/} J jiwelafor-s 754 izow 1% mj. as/ix UNITED STATESPATENT OFFICE.

LUTHER E. GROAT AND FREDERICK F. BRUSH, OF LOS ANGELES, CALIFORNIA,ASSIGNORS TO ELEVATOR SAFETY APPLIANCE COMPANY, A CORPORATION OFCALIFORNIA.

ELEVATOR-DOOR-OPERATING DEVICE.

Application filed May 26,

T 0 all whom it may concern:

Be it known that we, LUTHER E. GRoA'r and FREDERICK F. BRUSH, bothcitizens of the United States, and both residing at Los An eles, in thecounty of Los Angeles, State of (Jalitornia, have invented a newanduseinclude means for inhibiting the opening of the door at all timesthat the car is in motion and at all times that the car is at restexcept when it registers properly with a floor. The interlocks alsoinclude means for shutting off power from the door closing mechanism inthe event that the door meets an obstruction, as for instance, it it, byaccident, closes on a person, and means for looking the car in positionat the floor at all times except when the door is closed.

A. further object of the invention is to provide a door closingmechanism which will start the door from a position at rest andaccelerate it uniformly and smoothly, decelerating to a second positionof rest with a. large excess of power on either end of the stroke.

A further object of the invention is to provide a door operating devicewhich may be driven by an electric motor and in which the interlockfeatures necessary in connection with such a device are applied to theelectric circuit of that motor.

A further object of the invention is to provide a mechanism for openingand closing the doors which will have a. small number of parts and bevery rugged and compact in construction.

A further object of the invention is to provide a novel means foroiling.

A. further object of the invention is to provide a door operatingmechanism which is carried on the elevator car and which Specificationof Letters Patent.

Patented Dec. 13, 1921.

1919. Serial No. 299,979.

successively comes into position opposite a door locking and movingdevice at each door, together with means for throwing said mechanisminto operative relationship with said device when it is desired tooperate the door, said mechanism having at all other times aconsiderable clearance from said device.

Further objects and advantages will be made evident hereinafter.

Referring to the drawings, which are for illustrative purposes only,

Figure 1 is a somewhat diagrammatic view of an elevator hatchway with acar in place therein.

Fig. 2 is a front view of the same parts showing the method of operatingthe door.

Fig. 3 is a SlCQ view partly in section of the elevator door operatingmechanism.

Fig. 4 a section on a plane represented by the line a d of Fig. 3.

Fig. 5 is a section on a plane represented by the line 55 of Fig. 4.

Fig. 6 is section on a plane represented by the line 66 of Fig. 3.

Fig. 7 is a section through the magneticbrake on a plane represented bythe line 7-7 of Fig. 5.

Fig. 8 is a diagram of connections of the apparatus as applied to ahydraulic elevator.

Fig. 9 is a diagram of connections as applied to an electric elevator.

Fig. 10 is a perspective view of one of the limit switches.

Fig. 11 is a side elevation of the door actuating and locking device.

Fig. 12 is an end view of same.

Fig. 13 is a plan view of same.

Fig. 14 is a section on a plane represented by the line 14.14 of 111g.11.

Fig. 15 is a section on a plane represented by the line 1515 of Fig. 13.

Fig. 16 is a section on a plane represented by the line 1616 of Fig. 15.

In Fig. 1 an elevator hatchway is shown in which a car 22 is moved bymeans of a hydraulic plunger 23, a hydraulic elevator being selectedmerely for convenience of illustration, our invention being applicable swill r a i y e un er tand to anv ype of elevator. Located at each of thefloors 24 is a door 25 and a door actuating and locking device 26.Carried on the top of the car is a door operating mechanism 27. The dooractuating and locking devices 26 operates the door through a throw bar28 pivoted to v the building structure at 29., the throw bar beingdriven through a toggle 3O composed oftwo links 31 and 32 which may bebroken if necessary from the inside of the hatchway, or with certainlimitations from the outside of'the hatchway, to allow the door to beopened in the event that the actuating device becomes inoperative forany reason. The driving toggle 30 is so constructed that it is rigid atall times except when manually operated to allow the door to be opened.A counter weight 33 is provided on an extension 34- of the throw bar 28so that the door at all times tends to close under the action ofgravity, the door being shown in closed position in Fig. 2, the openposition being indicated by dotted lines 35 in that figure. The doorlocking device is provided with projections 36 and 37 by means of whichthe door is interlocked, locked and moved as will hereinafter beexplained.

' The door operating mechanismv 27 illus trated in detail in Figs. 3 to7 inclusive consists of a main frame 40- having journaled in the upperportion thereof a worm shaft 41 carrying a worm 42 and mounted in anysuitable form of bearings such as shown.

The shaft 41 is driven by an electric motor 43 and is provided with amagnetic brake 44. The magnetic brake 44 consists of brake wheel 45,brake shoes 46 pivoted at 4;

and connected to cores 48 and 49 which extend inside a coil or solenoid50. The cores 48 and 49 are held apart by springs 51, and when so heldapart, the shoes 46 contact with the wheel giving the braking action.Whenever the coil 50 is energized the cores 48 and 49 exert a mutualattraction, being pulled inwardly until the ends of the brake shoes 46strike against the frame 52 in which the whole device is carried. Thecoil 50 is connected in series with the field 53 of the motor 43, thearmature of which is shown at 54 in the diagrams.

Meshing with'the worm 42 is a worm gear 60, this gear being keyed on amain shaft 61 carried in bearings 62 and 63 supported by the mainframe40. The outer end of the shaft 61 and the bearing 62 is protected by asuitable dust cap 64. Mounted on the opposite end of the shaft 61 is acrank 65 having acrank pin 66 projecting from 'the extreme outer endthereof. The crank pin 66 turns in .a crank pin block70 which is free toslide up and down n a cross-head 71, this cross-head having a. T shapedbottom 72 fitting in a slide formed in the bottom of the frame 4Q, beingretained in place therein by a plate 73. The c'ross-head 7 is thus ofthese members 78 being hereinafter referred to as a closing drivingstrip and the other member 79 being referred to as an opening drivingstrip. Secured to a pin 80 on the finger 75 is an opening tension spring81, having its other end secured on apin '82 secured in the cross-head71. A closing tension spring 83 is secured on a pin 84 carried by thefinger 7 4, the other end being secured on a pin 85 carried on thecross-head 71 The spring 81 is so constructed that it is slightlystronger than necessary to openth-J door, and the spring 83 hasapproximately twice the tension of the spring 81. The driving strlps78and 79 pro ect outwardly from the side of the mechanism so that theycan readily engagethe projections 36 and 37 as .will hereinafter beexplained.

Secured by means of rivets to the 65 is a cam plate 91., this platehaving a cam surface 92 formed on its outer edge termihating near eitherend thereof angle portion 93'; Secured by means 0 screws 94 and 95 tothe plate 91 ar auxiliary cams 96 and'97. These cams ar provided withinclined surfaces 98 and 99 which in effect may be adjustablecontinuations of the surface 92 and form one side of grooves 100 and 101whose purpose will hereinafter be explained.

Turning'freely in the frame 40 are three shafts 116. 111 and 112 locatedas shown in Fig. 5. Each of these shafts is provided with a crankarmcarrying pins 113, 114 and 115, these pins fitting in the grooves 106and 101 previously described. Each of the shafts 110, 111 and 1.12carries an arm to which is fixed a moving contact as snown in Fig. 10.These moving contacts with their coiiperat-ing stationary contacts will,for convenience, be referred to as the closing limit switch 121, theopening limit switch 122 and the interlock switch 123 whose method ofoperation and purpose will be described in connection with thedia gramsfThe switches 121, 122 and 123 are carried in switch bones 125 carried asshown in Figs. 3 and 6 on the frame 40."

The finger 75 is provided with a stop to limit its outward movement andwith a small lug-131 which rests against a bar 132.

F ig. '4, being pivoted at 136 so that the forin aright-j move up anddown. The bars 13-2 1 5 ere normally held togcther by a tee sion'spring187 and each of these hers is connec 'h rod 138 or 139 with contacts plch belies 14:0

these contacts forio' r regis ering SW" 8 anti do swit h 151 e 0 ctiloor tei ower her the normal po The floor res;

open wneneve' beyond its 330 tmg the her 16-22 b e O JSCt of this deviceto switch 150 whei ever the open ving str'p 79 fails to ind the pro" ctiin its per position. The n 151 is open rnenever the door jenios t essivepressure on the ur if the inclosed except n partially closed by 9 downinto such no v slot 158 three l 154 having an v placed in the bottom or"the frame is t carried up by th crank pin 1 I eiocl: 40 end the gear andthe care te 91 so that the whole interior 0' the niecha sin is at alltiines well v ricrfitecl, the parts being so formed that orip from themechanism is returned to n of the frame 10.

A -y convenl 3 is may he provided it ividual doors and for tlie mediumof The apparatus 1131 76 18 a conelo oggetlier at the blocks plate 168by tee forina building tluc- Loving 1, casting 166 W1; 1 VJ), O11 \l 1&Cl 1: This niain lever .iiogcetions 38 and 3? i l J "l to theseprojections bebe eled a Wl at 169 a having the relative lengt 1 shown isFig 11 Carried n opposite end of he lever t ""0 which pressesagainsbetwee i 1T0 bein 3 in 1e, Pivoted y means of pin 1T5 pivoted on apin 177 carried in a shoe 1'? 8 which in turn is pivoted on a pin 17 9carried in the casting 166. The shoe 178 is provided with a rippinesurface 180 which isstraight and practi ally parallel with the line ofmotion of the casting 166 when the toggle formed by the members 171 and1Y6 is closed in he posi on shown in Fig. 15. This gripping en cc 1180is caught by a roller 181 carried in a ide 182 end held in the positionshown by a compression spring 183, the limit of its motion beinggoverned by an adjustable nut 184; on the outer end of stem 185 which lJ passes through one of the members 162. The

roller 181 also is in contact in this position with an inclined surface190 formed on the lower slide 181. It will be seen that with the partsin the position shown in Fig. 15 any attempt to move the door in thedirection of the arrow A will force the roller 181 into g jainhingrelationship between the surfaces 180 and 190 thus effectually lookingthe door against any movement.

It will he further evident that the main lever is rotated of l wheneverin the directi "he arrow B around the pin 16? that e roller 170 actingon the inclined surface 1 will break the toggle, oullin the fllicontactwith the d to be freely 1 and allowing;

It will he in -i the sur'ece 180 or some len locking action can. takeplace i several different positions thus door to be locked even if it isenema closed.

A bufi'er spring is provided to mine the position at rest of the cestiwith relation to the end member 196 is proyided to which the ni 82 ispivoted.

The rnethod of elect cal coniection applied to electr'c 8 s in 9, inwhich one i e y wires feeding throuiz ia switch anal.

fuses 208. The supp y wi e 201 is connected by a 20? to l the t .tio

I! contacts or a counter relev The ot 4.1 l 1 Lil 6 counter eec iis-connected to e wir tso oons :at the c1 1 contacts i 1e ioltage acrossthe arv w L iuetuie is above a piedeteiininec veins.

niar CODTQDlSIlt'lV set at approf niately ten per cent. of the normal"olt ge impressed on the g the relay then bei held open a counterelectro-inotive force gener ter 11 this arm ture even when the motor 1:3disconnects-l from the line so longias the arinatnze in motion. Inotherwords, the relay 205 is open at all times except when the motoris atrest or just about to come to rest, the objectof the relay 205 being toentirely cut oil the door operating-device at all time -when theelevator is in motion.

A car switch 210 is provided for manually interrupting the wiresj200,201 and208 and a series of fuses 211 is inserted in the wire 201 whichis connected to the series field 53 of the motor 54. The other terminal01" the series field 53 is connected through the brake coil 50 by meansof a wire 212 to the two contacts 213 and 214 of an opening relay 215and a closing relay 216. The'armature 54 of the door operating motor isconnected on one side to a wire 217 with the contacts 218 and 219 of theclosing relay 216, the other side of the armature 54 being connectedthrough a wire 220 with the contacts 221 and 222 of the opening relay215. The wire 200 is connected to the contact 223 of theopening relay215 and to the contact 224 of the closing relay 216. Bridging members225 and 226 in the relays 215 and 216 are in contact as shown in Fig. 9whenever the circuit to these relays is open, being pulled into an upperposition whenever the coils and relays are energized.

The operating coil of the relay 215 is connected on one terminal to thefloor registering switch 150 and the operating coil of the relay 216 isconnected on one terminal to the door jamb switch 151. The otherterminal of the coil of the relay 215 is connected through a wire 230with a contact 231 of a door operating controller 500, the otherterminal of the coil of the relay 216 being connected to a contact 232of that controller. A contact 233 of that controller is connectedthrough a wire 234 with the wire 200. The wire 208 is connected to thecentral point of the opening limit switch 122 and the closing limitswitch 121. When the door is closed thelimits 121 and 122 are in theposition shown in Fig. 9, the circuit between the wire 208 being closedthrough a wire 241 with the floor registering switch 150 and the circuitthrough a wire 242 being open to the door jamb switch .151.

For the purpose of preventing the manual control of the elevator frombeing operated when the door is open or in the process' of opening, weprovide contacts 250 and 251 in the door operating controller 500, thecontact 250 being connected through a wire 252 with one terminal of theinterlock switch 123, this switch being closed when the door is closed,and being connected through a wire 253 with the elevator control cable.The contact 251 is com nected through a wire 254 with the center 255 ofthe elevator controller so that the main circuit to the elevator controlis open at all times that connection is interrupted .the closing relay316.

between the contacts 250 and 251. This occurs whenever the controller500 is thrown open to open the door, the circuit remaining open untilthe door operating controller is thrown back into closed position. Theconbetween the contacts 231 and233 being established at this time bymeans of rings 262 which are electrically connected. While a diagramdrum top controller is shown for accomplishing this result, it isObvious that other equivalent means might be used if desired. 7

Our invention can also be applied with ex cellent advantage to ahydraulic elevator,

the diagram of connections therefor being shown in Fig. 8. In thisdiagram of connections, main supply wires 300 and 301 are carriedthrough a main switch 302 and main fuses 303, the wire 301 beingconnected to an auxiliary wire 304. The wire 301 is also carried througha water control switch 305 which is so arranged that it isclosedwhenever the. water supply to the hydraulic plunger is shut off,being opened whenever water is turned into the plunger to operate thecar. The wires 300, 304 and 301 are carried to a carswitch 310. The wire304 is connected through fuses 311 with the series field 53 of the dooroperating motor 54 and through the brake coil 50, and a wire 312 to thecontact 313 of the opening relay 315 and the contact 314 of the closingrelay. 316.

One terminal of the armature 54 is connected through a wire 317 with thecontacts 318 and 319 of the opening relay 315, the other terminal of thearmature being connected througha wire 320 with the contacts 321 and322of theclosing relay 316. The wire 300 is connected tocontact 330 of theopeningrelay'315 and to a contact 33 1 of The door operating controlleris shown diagrammatically at 340, the line m''a showing its closedposition and the line g g its open position. Stationary contact fingers341, 342, 343 and 344 are provided in the controller 340. The finger 341is connected through a wire350 with the coil 351 of the opening relay315, the other terminal of this c'oil being connected to a contact 352of the interlock relay 353. The contact 342 s connec e t he coi 3. o hec o i g I6- lay 316, the other terminal of this coil being connectedthrough a wire 355 with a door jainb switch 356, the other terminal ofthis switch being connected through awire 357 with one side of a closinglimit switch 358.

The other terminal of this switch is connected through a wire 359 withthe wire 301. This wire 301 is also connected to one terminal of anopening limit switch 360 the other terminal of this switch beingconnected through a wire 361 with a contact 362 on the interlock 353.The contact 343 is con nected through a wire 365 with a contact 366 onthe interlock which is also connected through a wire 36? with a contact368 on this interlock. The contact 370 of the interlock 353 is connectedto the wire leading from the contact 342 to the closing relay coil 354.The contact 344 is connected through a wire 371 with a contact 372 ofthe interlock which is also connected to the coil 373 of the interlock,the other terminal of this coil being connected through floorregistering switch'374 to a wire 375 which in turn is connected into thewire 304 at a point 376 just below the car switch 310.

The controller 340 is provided with seg ments 330 which connect thecontacts 341 and 343 hen the switch is open. Contacts 331 connect thecontacts 342, 343 and 344 all together when the switch is closed. Forthe puipos of providing locking means for the i g lover of the elevatorwe provide 111 l throw interlock sw1tch 390, the

JCUDTQ 35 center of 391 to suitable source of electric ower, this switchbeing adapted to be brown either to a contact 392 connecting aninterlock coil 393 on the operating lever or to a contact 394 connectedto the threshold light 395, the other terminals of the coil 303 and thethreshold light 395 being connected to the other source of power.Whenever the coil 393 is energized, the manual opera lever of theelevator may be moved. but when this coil is deenergized the manualoperating lever or" the elevator is locked.

The method of operation of an electric elevator having the diagram ofconnections illustrated in 9 will now be described.

1e e evator being at rest at any floor desired to go to any other floor.The

troller 255 is then manipulated to concor.

trol the armature 209 by any convenient method of connection not shown.Whenever voltage is placed across the armature 209, the coil 206 i isenergized and the circuit onarv contacts of the coune iforce relay 205is broken shutting o'lf any circuit cs 20'? and 203 and preventoi thedoor operating The car is moved to the floor mechanis a. at which it isdesired to stop and the conwhich is connected through atroller 255 ismanipulated to bring the car to rest, current being thus shut off fromthe armature 209. The counter electro-motive i orce relay 205 will,however, be held up as long as the armature 209 turns even if thearmature 209 is disconnected from the source or power the counterelect-ro-motive force of the armature being sufiicient to hold the relay205 open until the armature 209 practically comes to rest, thestationary contacts of the relay 205 then being bridged. The stationarycontacts of the relay 205 bethus closed it is possible to get powerthrough the control system of the door operating mechanism.

The operator then moves the controller 500 from the closed position wmto the open position g g/, making a connection between the contacts 231and 232. This completes a circuit through the wire 200 and the wire 234to the contact 233, through the movable contacts and 262 to the contact231 and through the wire 230 to the coil of the opening relay 215. Theother terminal of this relay is connected to the floor registeringswitch 150 and through the opening limit switch 122 to the wire 208which is connected through the counter electro-motive force relay 205 tothe wire 201 which is theother side of the circuit. The counterelectro-motive force relay 205 being closed, the opening relay 215operates. providing the floor registering switch 150 and the openinglimit 122 are closed which will be the case if the mechanism is in itsproper position. The opening relay. it these conditions exist, willtherefore lift, closing the circuit between the contacts 213 and 221.This completes a circuit through the wire 201. the field 53, the brakecoil 50 and the contact 213, through the moving contact 225 and thecontact 221 and through the wire 220 to the armature- 54, from thencethrough the wire 21'? to the contact 219, across the movable contact 226of the closing relay 216 which is down to the wire 200 thus closing thecircuit through the armature 54, the series field 53 and the brake coil50. This operates the magnetic brake 44 pulling the shoes 46 out ofcontact with the wheel 45 and allowing the motor 43 to drive the worm 42in a certain direction. This direction is such that the worm gear 60 isdriven in a clock-wise direction as viewed in Fig. 5, the parts at thisswitch 123 from its closed position as shown in the diagram into itsdotted position, thus closing the circuit to the threshold light.

These switches remain in this position until i the cam plate 91 haspractically Completed its movement at which time the opening limitswitch 122 is open. This opening of the openinglimit switch 122 opensthe circuit to the operating coil of the opening limit relay 215 thusopening the circuit through the armature 54L and the brake coil 50 whichstops the motor and applies the magnetic brake 44. This occurs wheneverthe cam "plate 91 has moved through approximately 170 degrees. Duringthe movement of the cam plate 91 through this 170 degrees the crank pin66 is also moved from itsposition shownin'F 5 to aposition 170 degreesin *a clockwise direction from this position.

In the position shown in Fig. 5 the crank pin block 70 holds the fingers74; and 75 apart against the tension of the springs '81 and 83, Thisholds the driving strips 7'8 and 7 9 apart so that in their movement upand down the shaft a considerable clear- This "obviates danger of theprojection 36 striking'upon and catching the driving strips 78 and'79 asthe car passes up and down.

The driving strips 78 and 79 are formed of spring material havingsufilcient elasticity v explained, that'thespring 83 is something overtwice the 'st rength of the spring 81, therefore the spring 83 pulls thefinger 7 1 to'beconsiderably bent due to displacement pt the members 36and 37 without injury to the strips. They are also so formed andsecuredthat in the event that they are struck byajny object projecting into thehatchway that they can be torn away without injury to any'of themechanism and can be replaced at small cost.

In its initial movement, as for example fromthe position shown in Fig. 5to the'po- *sition shown in Fig. 3, the crank pin block 70 movesdownwardly in the cross-head 71 without material movementotthecross-head 71' from-left to right across the frame 40. 507" In thisinitial movement the fingers 74 and 7 75 slide downwardly on the beveledsurface 69'al'lowing the lingers 74 and 7 5 to close inwardly under theaction of the springs 81 and 83. This throws the driving strips 78 and79' inwardly against the projections 36 and 37 if the car is properlyregistered with the floor which requires the closingfof the fingers 78and 79 on the parallel surfaces of the members 36and 37. In the eventthat the car is not in the proper position the finger 75 Wlll overtravel,'th1s over travelresulting in the lug 131 lifting the rod 132sufiicientlv :tO operate the floor registering switch 15 0 "through therod 139. The opening ot the floor registering switch 150 opens thecircuit .to the opening relay '215 and interrupts the armaturecircuitand stops the motor as has already been explained.

The further movement of the crank 'pin '66 throws the crank pin block 7Oentirely out of engagement 'with the fingers 74 and 75 and starts thecross-head 71 to moving from right'to left, as viewed in Figs. 3 and 5,in the fra'me 40. It should be understood that these figures are in theposition as viewed through the open door of the elevator, whereas'the'do or a'ctuatingfand locking'mechanism illustrated in Figs. 11 to16 inclusive-is in the position as viewed from the elevator car, andmovement from right to left therefore of the driving strips 7 8 and 79results in-a movement from left to right of the door actuatingmechanism. Thismovementfirst unlocks the door as has already beenexplained and then moves the door across the opening'until it is open atwhich time theparts "are in the position shownindotted lines in Fig.3and'the limits :oper ateas hasbeen previously explained to stop themechanism.

It will be noted that during the time that "the ntro11e ;500 is in theopen position, or with the 'stationary contacts on the line fy yjt hatthe-contacts250'and 251 are open, 'thus penmgtlie control circuit of themain motor of the elevation through the wires 252 and 254, "thuspreventing any movement of the armature2O7. It will also be noted'thatthe 'interlock"123 alsoopens this circuit.

It will be noted, as 'haspreviously been clamped --uponthe'members 36and37 preventingany lost motion therebetween, the spring 81being'infunction in opening and the spring 83' being'in function in closing.

. The door being open and the elevator being at reston the fioorfandthecontroller 50 O being in the position g gz the'door is closed'bymovingthis controller to the'line :g 'w'or to its closing position. Thiscloses "the circuit between-the contacts 232 and 233 closing a circuitfrom the wire 200 to the coil on theclosing relay 216, this circuitbeing completed through the door j amb switch 151, the closinglimit121,the wire; 208, the

counter electro-motive force relay 205 and the wire207 to the wire201.In theevent that the closing limit 121 is'not closed or the doorjambswitch 151 isnot closed this between the contacts 218and'214'thusclosof course cannotfoccurr The actuation of theclosingrelav 216 completes the circuit the brake coil 50, to thearmature 54, through the wire 217, from the armature 5 1, through thewire 220 to the contact 222 of the opening' relay 215 across thebridging contact 225 thereof to the contact 223 and to the wire 200,thus closing the circuit through the armature 5% in a reverse directionto that previously described, causing the motor 43, through the worm 12and the worm gear 60, to rotate the cam plate 91 and the crank pin 66 ina counter clock-wise direction as viewed in Figs. 3 and 5. This movementof the cam plate 91 actuates the limit switches 121, 122 and 123 asfollows:

At the start of this counter clock-wise motion the closing limit switch121 is closed, having been previously closed at the start of the openingmovement, .The opening limit 122 is open, this opening limit 122 be ingclosed at the start of .the closing motion. The interlock switch 123 isopen making contact to the threshold light. This interlock is not closeduntil the cam plate 91 practically completes its movement at which timethe opening of the closing limit 121 shuts off current to the motor. Inthe re verse motion of the crank pin 66 the crosshead 71 is moved fromleft to right as viewed in Figs. 3 and 5 across the main frame 10,closing the door through the medium of the spring 83. The tension of thespring 83 is suihcient for any normal operation of the door.

In the event, however, that the door jams due in most cases to strikinon some object in the doorway, possibly a person who has attempted toenter the elevator after the closing motion starts, the spring 83 issubjected to abnormal tension which pulls the projection on the finger74 away from the side of the cross-head 71 and moves the lug 131downwardly sufficiently to act upon the lower bar 35 and open thedoorjamb switch 151. This opening of the door jamb switch 151 opens thecircuit of the coil of the closing relay 216 and opens the circuit tothe armature 541 through the brake coil 50 thus shutting down the motor.If the obstruction is removed so that the tension of the spring 83 isreleased the door jamb switch 151 closes and reestablishes the circuitand the door continues to close. This closing 1 motion of the doorcontinues until the cam The method of operation of a hydraulic elevatorhaving the diagram of connections illustrated in Fig. 8 will now bedescribed.

It should be understood that these elevators are standard apparatus andthat the water valve operating switch 305 is found on all elevators ofthis type as well as the operating lever located by the coil 393 as haspreviously been explained. Under normal conditions the floor registeringswitch 371 is closed and the coil 373 is energized due to the fact thatthere is a circuit through the wire 300 and through the wire 365 to thecontact 366, from thence through the bridging member of the relay 353 tothe contact 372, through the coil 373 and the wire 331 to the wire 304:,the wire 30 1 being connected to the wire 301 forming the other terminalof the circuit. In other words, the relay 353 is always in its upperposition, closing the circuit between the contacts 366 and 372 andbetween the contacts 352 and 363 except under abnormal conditions whichwill hereinafter be explained.

With the relay in this position and with the car in any position, thecar is started by operating the water control switch (not shown) whichopens the switch 305 and disconnects the control mechanism for the dooroperating device. This mechanism remains disconnected until the elevatoris stopped by closing the water control valve which closes the switch305. The operator can then move the door controller 340 from the closedposition 50-50 to the open position yy,' and in so doing establishesconnections between the contacts 341 and 3 13. A circuit is thusestablished through the wire 300 to the wire 365, to the contact 3 13through the segments 380 of the contact 3 11, to the coil 351 of theopening relay 315, and from thence to the contact 352 across thebridging member of the relay 353 to the contact 362, through the wire361 to the opening relay switch 360, and from thence to the wire 301,thus completing the circuit.

The relay 315 being lifted due to its coil being energized, closes thecircuit composed of the wire 300, the contact 331, the bridging memberof the closing relay 316, the contact 322, the armature 541, the contact318 of the opening relay 315, the bridging member of that relay, thecontact 313, the brake coil 50, the series field 53 and the wire 304.This opens the brake on the door operating mechanism and energizes thearmature 5 1, causing the door to be opened.

During the time the door is opened the closing limit 358 is closed andthe opening limit 360 is open as has previously been explained. Theopening limit switch 360 in opening breaks the circuit to the coil 351allowing the relay 315 to open and thus interrupting the operation ashas previously been explained. The door can then be closed by a similaractuation of the relay 3l6'ivhich need not be explained, the operationbeing similar to that already explained "in the case of the electricallyoperated elevator.

In the event that the elevator door is left open With the controller 3&0in the position g 2 there is a possibility in a hydraulic elevator thatthe elevator will settle due to the Water leakage in the hydraulicallyoperated mechanism thereof. As soon as the elevator settles sutlicientlyto disturb the proper contact between the projection 86 of the closingdriving strip 78, the floor registermg relay 374 is operated as haspreviously been explained. The opening of this relay opens the circuitto the coil 873 of the interlock relay 358 thus opening the circuit tothe opening relay coil 351 and closing the circuit to the coil 354: ofthe closing relay 316 through the contacts 368 and 370. The closingrelay is theret'ore pulled upwardly even with the controller in the openposition yy,

thus starting the armature 54c and closing.

the door, the closing movement being stopped by the limit 858 in theusual manner.

It will be noted that the projections 36 and are of unequal length, theobject of this be ing to allow the closing projection 37 to close thedoor even after the driving strip 78 has broken connection With theprojec- 7 opens and closes the'elevator door.

2. An elevator door ooeratin mechanism 0 I e b l 0 comprising a irame,amotor, a main shart turnln 1n bGtIHII S in'said frame means e y lconnecting said motor to said shatt, crank on said shaft, a cross-headsliding in said frame, a crank pin block carried on said crank andslldmg in said cross-head at right angles to the line of motion of saidcrosshead, strips for driving said door carried by said cross-head, andmeans by which the.

movement of said crank pin block opens and closes said strips Withrelation to each other.

3. An elevator door operating mechanism comprising a frame, a motor, amain shaft turning in bearings in said frame, means connecting saidmotor to said shaft, a crank on said shaft, a cross-head sliding in saidframe, a'crank pin block carried on said crank and sliding in saidcross-head at right 'angles to the line of motion otsaid crosshead,fingers pivoted in said cross-head and V and elastic material and sosecured end oi": the travel of said crank, and

resting on said crank pin block in such a manner as to be actuatedthereby, and two driving strips each carried by one or said fingers.

4. In combination, mechanism for closing the door, a spring throughwhich said mechanism closes said door, and means for stopping saidmezhanism Whenever the pressure on said spri g exceeds a predeterminedvalue.

5. In combination, a building struc doors sliding in said structure, ancar moving in a vertical hatchvvay past said doors, a separate meanscarried insaid structure tor opening each or" said doors, a projectioncarried by each of said means, iTWO driving strips carried on said carfor said projection, said strips being normally separated to allowclearance with said projection, mechanism for forcing said stripstogether to grip said projection, and means for stopping said mechanismit said strips tail to touch said proiecan elevator door,

tion at the proper point. a

6. In a door opening derice adapteo to grip and move projectionoperating an elevator door, two strips so placed as to pass oncitherside or said projection when the elevator car registers with a floor,and for actuating said strips to move the said strips being formed ofrelatively and elastic material. l

7. In a door opening device adapted to grip and movea projectiononeratino .1. L3 elevator door, two strips so place i as to pas on e'tlside of said proje tion when t elevator car registers With a floor, andmeans for actuating saic strips tomove the door, said strips beingformed of relatively thin that they to the can be torn away withoutinjury mainder otthe device.

8. In a door 0 toner, avtran'ie, walls tornr ing a slide in the hottomot frame, cross-head moving in said slide, members projecting from'saidcross-head at some distance above said slide, said members alsoprojecting throi 1' a slot in said frame, and Walls inclosing said slidebelow saic. slot to retain oil about said slide.

9. an elevator, a door operatinr nism, actuating means for causi 5 saidmechanism to function and a counter electro-motive force relay connectedacross an armature actuated by the motion of the elevator for renderingsaid mechanism. inoperative at all times While said elevator is inmotion. 7

10. In an elevator door operating mechanism, a motor, a crank, means bywhich said crank operates he elevator door, limit switches for stoppingsaic motor vither an in terrupted gear through which said motor drivessaid crank said gear being of such 1 mecna proportions that it moves outof mesh if said when said controller is in the neutral polirnit switchesfail to function. sition.

11. In an elevator, a car controller 10- In testimony whereof, we havehereunto 10 cated in the car and manipulated by the operset our hands atLos Angeles, California, this 5 ator, a door controller located in thecar and 17th day of May, 1919.

manipulated by the operator, and means for LUTHER E. GROAT. renderingthe door controller operative only FREDERICK F. BRUSH.

